Easy! By carrying out tests on shrinkage, colour fastness and all other critical parameters that a garment is desired to meet. The big question is : although workwear might be suitable for “gentle” domestic washing to keep it clean, will it also be able to withstand a tougher industrial washing process?
ISO 15797 enables to reliably evaluate in advance whether the workwear in question will withstand tough and high temperature washing procedures - 75°C or even 85°C and high drying temperatures - 155°C for 4 minutes commonly used in industrial laundries. The rate of ageing of a workwear differs significantly between industrial and domestic washing. In the past, parameters or test methods to define the industrial laundry conditions did not exist. Previously the only internationally recognised test method for washing was the ISO 6330 on a domestic scale. This test method was not a reliable indicator of whether the garment would resist or suitably perform against the industrial washing and finishing processes prevalent for the workwear business, globally. ISO 15797 now fills this void.
Contrary to the ISO 6330 (domestic washing), a complete laundering test consists of a washing and a drying/finishing procedure, in which each specimen is washed in a washer / extractor and then dried / finished according to specific procedures. The standard also differentiates between tumble dry (temperature not to exceed 90° C) and tunnel / cabinet finishing (155° C for 4 minutes). By using ISO 15797, test conditions are much closer to the real-life conditions of an industrial laundry.
However, ISO 15797 does not provide a pass/fail test for any of these properties; nor does it provide a certification of conformity. The standard does not go so far as to provide an evaluation scale or criteria on suitability for industrial laundry. Nor does it state a recommended number of washes.
ISO 15797 method of washing gives clear procedures for testing workwear to ensure it will be of a suitable quality for customers leasing workwear from various industrial laundries around the globe.
Looking into the growing demands from the global markets for Industrially Launderable Flame Resistant clothing, TaraSafe® is now able to successfully produce and supply garments that meet the requirements of Flame resistancy as per ISO 15025 standard and shrinkage as per ISO 5077 after pre-treatment as per ISO 15797 standard.